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ALSACAT is my comprehensive catalog of UFO sighting reports in Alsace, the region is the North-East of France, whether they are "explained" or "unexplained".

The ALSACAT catalog is made of case files with a case number, summary, quantitative information (date, location, number of witnesses...), classifications, all sources mentioning the case with their references, a discussion of the case in order to evaluate its causes, and a history of the changes made to the file. A general index and thematic sub-catalogs give access to these Alsatian case files.

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Case of Aspach, on September 29, 2019:

Case number:



"William" a rapporté au site Web OVNI-France, son observation d'une "Boule argenté" du 29 septembre 2019 à 13:40 à Aspach, vue pendant 30 secondes:

"In the clear blue sky we saw a sort of shiny silver spherical shape in the sky above aspach it remained frozen for 30 seconds then disappeared in 1 sec."


Temporal data:

Date: September 29, 2019
Time: 13:40
Duration: 30 secondes.
First known report date: 2019
Reporting delay: Day, 3 months.

Geographical data:

Department: Haut-Rhin
City: Aspach
Place: ?
Latitude: 47.462
Longitude: 7.235
Uncertainty radius: 3 km.

Witnesses data:

Number of alleged witnesses: ?
Number of known witnesses: 1
Number of named witnesses: 0
Witness(es) ages: ?
Witness(es) types: ?

Ufology data:

Reporting channel: By the Web to the "" Website.
Type of location: ?
Visibility conditions: Day.
UFO observed: Yes.
UFO arrival observed: ?
UFO departure observed: ?
Entities: No.
Photographs: No.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: ?
Witnesses interpretation: ?


Hynek: DD
ALSACAT: Totally insufficient information.



Copie d'écran.

Date: 09/29/2019

Department: 68 (Haut-Rhin)

Location: Aspach

Time: 1:40 p.m.

Number of witnesses: 1 people

Type of sighting: DD: Daylight Discs

Approximate observation time: 30 seconds

What was seen: Silver ball

Description of the facts:

In the clear blue sky we saw a sort of shiny silver spherical shape in the sky above aspach it remained frozen for 30 seconds then disappeared in 1 sec.




The "sort of silver spherical shape" is such a generic description, that in the absence of further details one might think of an airliner, helicopter, balloon, alien craft, etc.

The sudden disappearance after 30 seconds may be due to the end of a reflection of the sun on such an object.


Totally insufficient information.

Sources references:

* = Source is available to me.
? = Source I am told about but could not get so far. Help needed.

File history:


Main author: Patrick Gross
Contributors: None
Reviewers: None
Editor: Patrick Gross

Changes history:

Version: Create/changed by: Date: Description:
0.1 Patrick Gross August 25, 2022 Creation, [ofe1].
1.0 Patrick Gross August 25, 2022 First published.

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This page was last updated on August 25, 2022.